This paper introduced to found a strength formula of the pit sand concrete depend upon the statistical principle, as well as the selected table of the sand ratio and water content.

本文作者介绍了如何利用统计学原理建立山砂砼强度公式、合理砂率选用表及用水量选用表，并说明了如何利用这几项技术指标进行配合比设计。

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The children tumbled about in the sand pit.

小孩在沙坑里翻滚着玩。

《新英汉大辞典》

He was standing by the pit he had dug in the dry sand, with a huge water pot beside it.

他正站在他挖的干砂洞旁，旁边还有一个巨大的用来盛水的锅。

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These terms are essentially trivial: amounting to little more than an admonition to play nice with the other boys and girls in the sand pit.

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An attendant dug a sand pit for me.

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It is traditionally prepared by beheading and gutting the shark and then burying the carcass in a shallow pit covered with gravelly sand.

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